Housing, Inflation, and America's Renters, All Have an Airbnb Problem

Chief Economist Eugenio J. Alemán discusses current economic conditions.

June’s rate of inflation showed, for the first time in several years, an important slowdown in shelter costs, something that economists, us included, have been expecting for a very long time but had not materialized. July’s shelter costs came roaring back and posted a 0.4% month-over-month increase once again, accounting for 90% of the increase in inflation during the month. Typically, shelter costs take a relatively long time to come down due to the way Owner’s Equivalent Rent (OER) is calculated within the Consumer Price Index (CPI). But this time around, as has been the case for other economic indicators after the pandemic, it has been very different.

One potential reason for why shelter costs have remained stubbornly high until now could be related to what economists’ call ‘alternative’ or ‘competitive’ uses. That is, a good or service’s price is intimately related to how many uses that good or service has. One example of a good that often comes to mind regarding ‘alternative uses’ is that of baking soda. We have seen baking soda (or sodium bicarbonate), which is something that is typically used in cooking, also inside closets, and fridges, as a cleaner, weed killer, etc., and according to the website in the footnote below, baking soda has 34 different uses.1 Maybe many of these ‘alternative’ uses for baking soda are not very efficient and/or probably they don’t work at all, but extending a good’s perceived uses has the potential for increasing the demand for a good and thus, the potential for increasing the price of that good, especially if the supply of this good is relatively inelastic. 2

Furthermore, although we could not find any study that showed whether the demand and/or supply of baking soda is elastic or inelastic, it is fair to say that the product is readily available, relatively cheap, and unlikely to face supply constraints. At the same time, it is fair to say that baking soda’s uses face lots of competition from other products. This means that baking soda’s demand and supply are probably highly elastic, that is, a rightward shift in the demand curve produces a small increase in the price of the product. Thus, even if the industry finds alternative uses for a product, the price of that product, in this case, baking soda, is probably not going to increase by much.

However, that is not the case for housing, whose price elasticity of supply is highly inelastic. The supply of homes is almost vertical in the short to medium run, i.e., perfectly inelastic. That is, an increase in the demand for housing increases the price of homes with very little effect on the number of homes available for sale in the short to medium term. This is a reflection of how difficult it is to build a home, how long it takes to construct homes, and how difficult it is, especially in some markets, to get the necessary permits to build, among other constraints.